99989

Properties

Appears in sequences

• a(n) = ceiling(n*phi^17), where phi is the golden ratio, A001622.at n=28A004972
• Primes that contain digits 8 and 9 only.at n=6A020472
• Largest n-digit prime with maximum digit sum.at n=4A069662
• Largest n-digit member of A087593. Define dd(k) = the number formed by concatenating the absolute difference of successive digits of k. Sequence contains largest n-digit prime p such that dd(p) is also prime.at n=3A087596
• a(n) = largest prime using least number of possible digits with a digit sum n, or 0 if no such number exists. E.g., if n > 9 and there are no two-digit primes with a given digit sum n then three-digit numbers are explored and so on.at n=43A088115
• Lesser of the greatest twin prime pair with n digits.at n=4A092250
• Reverse digits of largest primes, append to sequence if result is larger prime then previous one with reverse digits.at n=30A098922
• Near-repdigit primes with 9 as repeated digit.at n=20A105975
• Primes with digit sum = 44.at n=1A106776
• Largest n-digit prime whose digit reversal is also prime.at n=4A114019
• Greatest hypotenuse of primitive Pythagorean triangle not exceeding 10^n.at n=4A117341
• Reverse digits of largest Chen primes, append to sequence if result is larger Chen prime then previous one with reverse digits.at n=23A118496
• Primes of the form k^5-k-1.at n=4A126425
• a(n) = n^5 - n - 1.at n=9A126426
• Emirps with only composite digits (i.e., 4, 6, 8, 9).at n=3A128389
• Near-repdigit emirps.at n=23A173594
• The larger member of a near-repdigit emirp pair.at n=11A173596
• Primes of the form 10^n - 2*n - 1.at n=1A173839
• Primes of the form 10^n-prime(n).at n=1A193825
• Number of length 2+3 0..n arrays with some disjoint pairs in every consecutive four terms having the same sum.at n=27A247534